Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a776b1ee3a4c05…

MALICIOUS

PDF

92.0 KB Created: 2021-03-15 07:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5a5be2f36d21f1eaf25b34daea0efbe5 SHA-1: 22b91163c96827e65347cd1cc2b121a7377ac909 SHA-256: 18a776b1ee3a4c05d54a23cdbd735473346cae88f2d3e2b2bc7bf2a4b9f52a00
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=guitar+music+theory+cheat+sheet+pdf PDF link annotation
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/94288a3954bbf37.pdfIn PDF document text
    • http://vladport.ru/are_rapid_diagnostic_tests_accuratevx8ry.pdfIn PDF document text
    • https://fovevirikat.weebly.com/uploads/1/3/0/7/130775443/gikowusujuk-remuwivoreneviz-timipate.pdfIn PDF document text
    • https://mibebedobosuv.weebly.com/uploads/1/3/4/3/134322580/3932565.pdfIn PDF document text
    • http://thefortykuti.com/wipebadowewabuvppfuj.pdfIn PDF document text
    • http://igonlinesupport.com/banutenowajipumjsyb8.pdfIn PDF document text
    • http://netewe9.xyz/murray_push_mower_walmart3g52l.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/doxawetuxunu.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/rebetab-tuxunufa.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/nafaju.pdfIn PDF document text
    • http://hookup153.online/3d_tennis_mod_apk_download1bn23.pdfIn PDF document text
    • http://bestunew.xyz/also_sprach_zarathustra_concert_bandfc9ka.pdfIn PDF document text
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/2190100.pdfIn PDF document text
    • http://study-english-04.space/wasenalituzofetivitugudqz.pdfIn PDF document text
    • http://reduslim-shopofficial.site/learning_upgrade_add_count_together67imn.pdfIn PDF document text
    • http://bodyita.space/booty_farm_imagesf6950.pdfIn PDF document text
    • http://lumacy.site/surah_al_mulkxg46v.pdfIn PDF document text
    • http://monoga.space/emirates_cabin_crew_uniform_2018lohv3.pdfIn PDF document text
    • https://ripumunilemaz.weebly.com/uploads/1/3/5/3/135302863/1406954.pdfIn PDF document text
    • http://parkingtest.xyz/how_to_structure_a_pitch_deck029ie.pdfIn PDF document text
    • http://form-copyrightservices.com/sediferaloxutajovojono7w1of.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/gopisejemogolabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 5496 bytes
SHA-256: 3855a837ed45a1d14b0263789fbbcd42a24cceef1a27ba5be0f49db8d50c4153
font_01_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 12000 bytes
SHA-256: b2b0a12a2b59242ccdd0f691b92d88c0358cb0fd85765751788d1d5131e118f3
font_02_sfnt_off00014dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAB 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52